Files
strfry/src/apps/relay/RelayNegentropy.cpp
Doug Hoyte 206b14a473 sync optimisations, DBQuery no longer loads eventPayload
- It is now up to the caller to do so
- QueryScheduler now can optionally not bother to ensure that the events are fresh
2023-07-29 01:14:38 -04:00

182 lines
5.8 KiB
C++

#include <Negentropy.h>
#include "RelayServer.h"
#include "QueryScheduler.h"
struct NegentropyViews {
struct UserView {
Negentropy ne;
std::string initialMsg;
std::vector<uint64_t> levIds;
uint64_t startTime = hoytech::curr_time_us();
};
using ConnViews = flat_hash_map<SubId, UserView>;
flat_hash_map<uint64_t, ConnViews> conns; // connId -> subId -> Negentropy
bool addView(uint64_t connId, const SubId &subId, uint64_t idSize, const std::string &initialMsg) {
{
auto *existing = findView(connId, subId);
if (existing) removeView(connId, subId);
}
auto res = conns.try_emplace(connId);
auto &connViews = res.first->second;
if (connViews.size() >= cfg().relay__maxSubsPerConnection) {
return false;
}
connViews.try_emplace(subId, UserView{ Negentropy(idSize), initialMsg });
return true;
}
UserView *findView(uint64_t connId, const SubId &subId) {
auto f1 = conns.find(connId);
if (f1 == conns.end()) return nullptr;
auto f2 = f1->second.find(subId);
if (f2 == f1->second.end()) return nullptr;
return &f2->second;
}
void removeView(uint64_t connId, const SubId &subId) {
auto *view = findView(connId, subId);
if (!view) return;
conns[connId].erase(subId);
if (conns[connId].empty()) conns.erase(connId);
}
void closeConn(uint64_t connId) {
auto f1 = conns.find(connId);
if (f1 == conns.end()) return;
conns.erase(connId);
}
};
void RelayServer::runNegentropy(ThreadPool<MsgNegentropy>::Thread &thr) {
QueryScheduler queries;
NegentropyViews views;
queries.ensureExists = false;
queries.onEventBatch = [&](lmdb::txn &txn, const auto &sub, const std::vector<uint64_t> &levIds){
auto *view = views.findView(sub.connId, sub.subId);
if (!view) return;
for (auto levId : levIds) {
view->levIds.push_back(levId);
}
};
queries.onComplete = [&](lmdb::txn &txn, Subscription &sub){
auto *view = views.findView(sub.connId, sub.subId);
if (!view) return;
LI << "[" << sub.connId << "] Negentropy query matched " << view->ne.items.size() << " events in "
<< (hoytech::curr_time_us() - view->startTime) << "us";
if (view->ne.items.size() > cfg().relay__negentropy__maxSyncEvents) {
LI << "[" << sub.connId << "] Negentropy query size exceeeded " << cfg().relay__negentropy__maxSyncEvents;
sendToConn(sub.connId, tao::json::to_string(tao::json::value::array({
"NEG-ERR",
sub.subId.str(),
"RESULTS_TOO_BIG",
cfg().relay__negentropy__maxSyncEvents
})));
views.removeView(sub.connId, sub.subId);
return;
}
std::sort(view->levIds.begin(), view->levIds.end());
for (auto levId : view->levIds) {
try {
auto ev = lookupEventByLevId(txn, levId);
view->ne.addItem(ev.flat_nested()->created_at(), sv(ev.flat_nested()->id()).substr(0, view->ne.idSize));
} catch (std::exception &) {
// levId was deleted when query was paused
}
}
view->levIds.clear();
view->levIds.shrink_to_fit();
view->ne.seal();
auto resp = view->ne.reconcile(view->initialMsg);
view->initialMsg = "";
sendToConn(sub.connId, tao::json::to_string(tao::json::value::array({
"NEG-MSG",
sub.subId.str(),
to_hex(resp)
})));
};
while(1) {
auto newMsgs = queries.running.empty() ? thr.inbox.pop_all() : thr.inbox.pop_all_no_wait();
auto txn = env.txn_ro();
for (auto &newMsg : newMsgs) {
if (auto msg = std::get_if<MsgNegentropy::NegOpen>(&newMsg.msg)) {
auto connId = msg->sub.connId;
auto subId = msg->sub.subId;
if (!queries.addSub(txn, std::move(msg->sub))) {
sendNoticeError(connId, std::string("too many concurrent REQs"));
}
if (!views.addView(connId, subId, msg->idSize, msg->negPayload)) {
queries.removeSub(connId, subId);
sendNoticeError(connId, std::string("too many concurrent NEG requests"));
}
queries.process(txn);
} else if (auto msg = std::get_if<MsgNegentropy::NegMsg>(&newMsg.msg)) {
auto *view = views.findView(msg->connId, msg->subId);
if (!view) {
sendToConn(msg->connId, tao::json::to_string(tao::json::value::array({
"NEG-ERR",
msg->subId.str(),
"CLOSED"
})));
return;
}
if (!view->ne.sealed) {
sendNoticeError(msg->connId, "negentropy error: got NEG-MSG before NEG-OPEN complete");
return;
}
auto resp = view->ne.reconcile(msg->negPayload);
sendToConn(msg->connId, tao::json::to_string(tao::json::value::array({
"NEG-MSG",
msg->subId.str(),
to_hex(resp)
})));
} else if (auto msg = std::get_if<MsgNegentropy::NegClose>(&newMsg.msg)) {
queries.removeSub(msg->connId, msg->subId);
views.removeView(msg->connId, msg->subId);
} else if (auto msg = std::get_if<MsgNegentropy::CloseConn>(&newMsg.msg)) {
queries.closeConn(msg->connId);
views.closeConn(msg->connId);
}
}
queries.process(txn);
txn.abort();
}
}